.body{
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
/* 头部导航栏 */
.navBar{
    width: 100%;
    display: flex;
    justify-content: space-around;
    line-height: 60px;
    border-bottom: 1px solid #666;
}
.navBar a{
    color: #666;
    height: 60px;
    width: 80px;
    text-align: center;
}
.navBar a.on{
    color: #4294FF ;
    font-size: larger;
    font-weight: bold;
    border-bottom: 2px solid #4294FF;
}
 /* 身体 */
    .main{
        flex-grow: 1;
        display: flex;
        flex-direction: column;
        padding: 10px;
        overflow-y: scroll;
    }
    .main>p{
        margin-top: 10px;
        margin-bottom: 10px;
    }
   
    /* 新课 */
    .new{
        overflow: hidden;
        width:100% ;
        height: 210px;
        border-radius: 15px;
        box-shadow: 0 0 10px #666;
        flex-shrink: 0;
    }
    .new h1{
        font-size: 16px;
        margin: 5px;
    }
    .new p{
        font-size: 12px;
        color: #666;
        margin: 5px;
    }
    /* 课程 */
    .main .course1,.course2,.course3{
        width: 100%;
        box-shadow: 0 0 10px #666;
        height: 140px;
        border-radius: 15px;
        background: url(../../assets/img/course-img04.jpg) no-repeat;
        background-size: cover;
        background-position: top;
        margin-bottom: 15px;
        flex-shrink: 0;
        padding-top: 40px;
        padding-left: 20px;
    }
    .main .course2{
        background: url(../../assets/img/course-img03.jpg) no-repeat;
        background-size: cover;
        background-position: top;
    }
    .main .course3{
        background: url(../../assets/img/dog.png) no-repeat;
        background-size: cover;
        background-position: top;
    }
    .main h3{
        margin-bottom: 10px;
    }